a = {"zero":0, "one":1, "two":2, "three":3, "four":4, "five":5, "six":6, "seven":7,"eight":8,"nine" :9}
c = input ()
k = c. split(" ")
p=""
prost = [2]
n=1001
for i in range (100, n+1):
    ksun = 0
    for j in prost:
        if i %j==0：
            ksun=1
    if ksun==0:
        prost. append (i)
for i in range(len(k)):
    l = k[i]
    p = p + str(a[l])
p = int (p)
if p in prost:
    print (p)
else:
    prost. append (p)
    print (sorted (prost))
    for i in range(len(prost)):
    if p in prost:
        print (prost [i])
